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Descompusa in produs de factori expresia (x la a doua +2x+1)+3x(x+1) este :
a)(x+1)(4x+1) b)3x(x+1) c)(x+1)(4x+2) d)(x+3) la a doua



Răspuns :

( x²[tex] + 2x + 1 ) + 3x( x+1) = ( x+1) \\ [/tex]² [tex]+ 3x(x+1) \\ [/tex]

[tex]=>(x+1)(x+1) + 3x(x+1) \\ [/tex]
[tex]=>(3x+x+1)(x+1) => ( 4x+1)( x+1) -> a) . \\ [/tex]